[GRASSLIST:6019] Re: How deep is a region?

[David Adam]

Hamish wrote:

>>I'm trying to set up a region, starting with a Landsat TIFF
>>image from California.  I have imported the region with r.in.gdal,
>>which produces a large file. I then close grass60 and reopen in the
>>new location, at which point I get the errors
>>
>>
>>GRASS_INFO_ERROR(5579,1): default region is invalid
>>GRASS_INFO_ERROR(5579,1): line 15: <depths:     -1074916636>
>>
>>The relevant file for the region is
>>
>>DEFAULT_WIND --
>>
>>proj:       99
>>zone:       0
>>north:      213720.89780907
>>south:      -6149.10219093
>>east:       -168613.96484194
>>west:       -404623.96484194
>>cols:       7867
>>rows:       7329
>>e-w resol:  30
>>n-s resol:  30
>>top:        1
>>bottom:     0
>>cols3:      7867
>>rows3:      7329
>>depths:     -1074916636
>>e-w resol3: 30
>>n-s resol3: 30
>>t-b resol:  1
>>
>>--------------
>>
>>Most of the fields in the file are explained in the REGION section
>>of the manual, but I can't seem to find anyplace that defines or
>>explains what the "depths" field is about.  But until I can get
>>grass to accept the region, I can't do much of anything.
>>
>>All help is much appreciated...
>>    
>>
>
>
>rows,cols, and res=30 all look right. I don't know what is causing the
>depths to go nuts. Try editing the "WIND" file in your mapset to make
>depths: 1?
>
>
>maybe this works as a temporary workaround--
>
>try viewing the GeoTIFF meta-data with "gdalinfo".
>
>If the meta-data is bogus, wipe it clean with:
>
>tifftopnm map.tiff | pnmtotiff > map_clean.tiff
>
>
>This will wipe all geo-coding, but you should be able to load into a X,Y
>location ok and at least view the data. May rectify from there.
>
>
>
>Hamish
>
>
>  
>
Thanks, I'll give that a try.
In response to another reply, this is happening under Grass6.0.0beta2.

But one of my questions still stands: What does depth represent?  The 
other terms in the
DEFAULT_WIND file are defined in the g.region documentation, but not 
depth.  If I knew
what it stands for, perhaps I could guess the right value.

Thanks for the help!

david